A series of electrically neutral lipophilic di‐, tri‐, and tetra‐amides containing tertiary‐amine N‐atoms were prepared in order to investigate their selectivity for alkali and alkaline earth metal cations in solvent polymeric membranes. Considerable selectivity changes were observed for membranes incorporating certain of these ligands as compared with ligand‐free membranes. A 1:1 cation/ligand complex was isolated from N , N′, N ″‐triheptyl‐ N , N′, N ″‐trimethyl‐nitrilotriacetamid and Mg (SCN) 2 whereas with Ca (SCN) 2 the corresponding 2:3 cation/ligand complex was formed. N , N ′, N ″, N ‴, N ‴‐tetramethyl‐ethylenediaminetetraacetamide yields a 1:1 cation/ligand complex with Mg (SCN) 2 .
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Erne et al. (1980) studied this question.